Yuu is a young girl of average height. She has shoulder-length auburn hair, which is mostly smooth, but has tufts of messy hair pointing outwards, and her fringe is parted in the left. She also has brown tareme eyes. She is an E-cup.
She is usually seen wearing the regular Operator uniform with a pink sweater.
Kunichika is friendly and kind, as evidenced by her not bullying Yuiga like Tachikawa and Izumi do. She appears to be an "older sister" figure to her younger teammates and the voice of reason in her team, such as stopping fights between Izumi and Yuiga. She seems to be a nerd, as indicated by the vast collection of Video Game consoles in her room.
- Kei Tachikawa: They seem to have a good relationship, as they're seen playing videogame together when Osamu visits Tachikawa Unit's Operation Room. Tachikawa described her as the moon behind the three swords in Tachikawa Unit's emblem.
- Kōhei Izumi: They appear to have a good relationship, and she has been described as very useful by Izumi.
- Takeru Yuiga: Unlike Tachikawa and Izumi, she doesn't bully Yuiga. He turns to her when he feels bullied, which means she might be lenient towards him.
Kunichika greets Osamu when he visits Tachikawa Unit's operation room for training. She then plays video games with Tachikawa, where she dominates.
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- She likes Ishikari Nabe (a type of hot pot from Hokkaido), buttered potatoes and all types of games.
- According to Ashihara's Q&A, Kunichika's mother is from Hokkaidō.
- Her Japanese voice actress, Umeka Shōji, also voices Mizunuma, Itsuki Fujisawa and Yūko Kumagai; while her Japanese voice actress also voices Yōtarō Rindō.